Improvement in excavators



THOMAS SYMONDS.

Improvement in Excavators. J'NO, 114,878 Patented May16,187l.

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Letters Patent No. 114,878, dated' May 16, 1871.

. IMPROVEMENT m ExcAvA'roRs.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom wit-may concern Be it knnwn that I, THOMAS SYMONDS, of Portland, in the county of Cumberland and State of Maine, have invented a new and useful improved Excavator; and I hereby declare .the following to he a full, clear, and exact description thereof, which will enable others to make and use my invention, reference being bad to the accompanyingdrawing forming part of this specification, in which Figurel is a side elevation.

Figure 2, the-same in a different position.

Figure 3, a detail of the hooks to hold the end of the'arm h. I

My invention relates to animproved device for excavating earth, and has for its particular object an improved device for emptying or discharging the earth from the scoop or shovel when the same, is once filled.

My scoop or shovel is suspended in a support'or derrick, as is common. g

. The scoop is placed in position on the earth, and then, by proper machinery, drawn along the earth, and scoops up the soil. 1

When the operation is completed, the scoop is then raised and swung around to where the earth in the scoop is to be emptied, and then, the scoop is allowed to trip, where desired.

Reference to the drawing will better explain the invention.

A is the scoop.

b, the arms by'which it is drawn along the earth.

'by a certain device,

These are pivoted to the forward end of the scoop, at-

0, so that the position of the arms relatively to the scoop may be changed, as illustrated in the two figures.

d isa chain extending from b to the arms e. These arms are so pivotedto thefscoop A as to allow them motion, as seen in the two figures.

h is an arm, pivoted at n, and having the shoulder 'm. There aretwd of these arms, one on each side of the scoop, as there are also two springs, g.

j is a pin on the arm 0, which, when the said pin is forward of the shoulder m, keeps the arm e upright, as shown in fig. 1. 1

and the earth is discharged when it is drawn down, so. that the pin j will slip over m, then 0 will bein the position seen in fig. 2.

Thisresults from the scoop tipping forward, as in fig. 2. v The shoulder at is drawn' down so as to allow the pin j to slip over it, by drawing upon the back end'of h. 'Llo'do this thereis'acord extending from the rear endof h up to the cross'piece of the frame, support, or

derrick on which the whole scoop is suspended.

When the strain of the cord is removed the spring 9 I will throw the forwardve'nd ofh up again, and, the pin slipping over it,

on. v

c isfdrawn forward to the upright position by the draft of the rope or-chain on b, connected to the power applied to the scoop.

This rope or chain -will draw 7) down to a horizontal position, as seen in fig. 1, and, consequently, with it, will draw 0 up to the vertical position, and.throw the pin j over the shoulder m.

The operation is as follows:

The scoop is placed on the earth, the power is applied, and it is drawn into the soil, being directed by the handlela, until it is filled. It is then raised by the rope attached to the top of c.

When raised and swung to the proper position the rope attached to the rear end of 71. is drawn up. This releases ,the pin j on the shoulder m, and the scoop tips, as in fig. 2, and discharges its contents. It is then lowered, and thefil'ling again begun.

When power is applied to fill it again, I) is drawn down horizontally, and a up to'a vertical" position, the' m, and the same pin j slipping over the shoiilder process as above is repeated.

, What I claim as my invention, and desire to secure by Letters Patent, is

The combination of the c with pivot and pin j,

der m,

pivoted arm b chain d, arm arm h, with spring g, and shoularranged and applied as herein set forth. 1 THOMAS SYMONDS. Witnesses:

W. H. OLIFFoRD,

WM. FRANKLIN SEAVEY.

c is again held in an upright posi- 

